According to soil test results in the 1980s, soil organic matter and total nitrogen content in cotton fields in Jiangxi Province were approximately 1.19% and 0.096%, respectively. Organic matter was lower than the 1.35% level in the Yangtze River Basin; soil available P (P2O5) content was approximately 18 ppm. , Which belongs to the category of heavy phosphorus deficiency; soil available potassium (KO2) content is about 124ppm, lower than the level of 126ppm in the Yangtze River Valley; soil available boron content is about 0.38ppm, which belongs to the category of severe boron deficiency and potential boron deficiency. Therefore, with the increase of organic fertilizers and trace elements, and at the same time when interplanting, it is conscious to arrange some land-cultivated crops. Combining land use with land-raising and fertility and fertility will play a particularly important role in increasing cotton production in Jiangxi.

The growth and development of cotton is relatively sensitive to the demand for fertilizer, and the ratio of the total amount of nitrogen (N), phosphorus (P2O5), and potassium (K2O) reaches 1:0.4 to 0.5:1. At the same time, the demand for nitrogen, phosphorus, and potassium at different growth stages varied greatly, with emergence, buds accounting for 4.5%, 2.0%, and 2.8% of the total amount respectively; buds and first flowers accounted for 11.5%, 7.9, and 9.0 of the total usage, respectively. %; First flower - Shenghua accounted for 56.7%, 24.0% and 36.5% of the total amount respectively; Shenghua ~ Botula accounted for 27.9%, 65.5% and 51.7% of the total dosage, respectively. According to the characteristics of growth and development of cotton and its requirement for fertilizer, the production of 100 kilograms of lint per mu in the production practice usually requires 1,500 to 2,000 kilograms of pig manure, 75 to 100 kilograms of cake fertilizer, and 50 to 60 kilograms of phosphate fertilizer (superphosphate). , Potassium 25 to 30 kg, urea 40 to 45 kg, boron 0.5 kg, zinc 1.0 kg. The specific fertilization method is roughly as follows:

1. Lightly applied seedbed fertilizer: When finishing the seedbed at the end of March, spread 1.5-2.5 kg of high-efficiency compound fertilizer evenly per seedbed, and use it as a nutrient fertilizer. 5 to 7 days before transplanting, 50 to 75 kilograms of diluted human urine with water is applied to each seedbed, and 0.2 to 0.3 kg of urea is added. Before spraying, 0.5-1% calcium superphosphate leachate was sprayed (mixed evenly during spraying to avoid injury) to promote rooting.

2, acupuncture points Anjiajiao: Anjiajiao is to promote rapid seedling growth, as early as the main nutrition base of high yield, but when applied, they must pay attention to make cotton seedlings stable in Shenglei period, the early flowering period has a yellowing process . According to this principle, generally 7.5 to 10.0 kilograms of compound fertilizer is applied to the bottom of transplanting holes.

3, early Shi Ti Miao Fei: Early recovery Miao Fei, is conducive to promoting the early emergence of cotton seedlings, early bud, early hair trees. Miao Fei should be based on the principle of early application, light application, generally topdressing about 2 times nitrogen fertilizer. After transplanting for 5 to 7 days, Pushi once raised the seedlings and used 5-7 kg of urea per mu. Then look at the world to see seedlings and then make up a balance of fertilizer, mu application of diluted water 300 to 350 kg, mixed with urea 5 to 6 kg.

4. Stable bud stage fertilizer: The general principle of the application of bud fertilizer is "the quantity should be sufficient, the variety should be complete, the time is appropriate, and the stability should be promoted." Generally 50-75 kilograms of cake with fertilizer, 35-40 kilograms of phosphate fertilizer (superphosphate), 15-20 kilograms of potash, 0.5 kilograms of borax, and 1.0 kilogram of zinc fertilizer are mixed and applied in narrow rows during budding period (around mid-June). . For the second and third types of cotton field with the application of available nitrogen fertilizer, in order to promote balanced growth.

5. Reapplying flower and bell-fertilizer: Reapplying flower and bell-fertilizer, besides being conducive to satisfying the nitrogen fertilizer required for flowering and bell-ringing, can also satisfy the requirement of maintaining the vegetative growth of stem and leaf for nitrogen, thereby promoting multi-flowering, multi-fruit peach and knot peach. Mu 25 kg of cake fertilizer, 20 kg of urea, potassium fertilizer 7.5 ~ 10.0 kg in the flower bell period (mid-July) mixed buried in the wide line ditch.

6, Pu Shi cover top fertilizer: In order to meet the growing, increasing the growth and development needs of bolls, and strive to multi-junction Qiu Tao, Pushi once cover fertilizer. Mu with urea 5.0 ~ 7.5 kg in the middle and late August, combined with drought applied to wide line, promote the top of the peach.

7, spray foliar fertilizer: After entering the boll opening period, we must promptly spray foliar fertilizer, promote the photosynthesis of functional leaves. Combine with spraying, apply 0.2% potassium dihydrogen phosphate and 1-2% urea once every other week for 2 or 3 times.

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